11/5000 A brief introduction to uv absorbers

Uv absorber is a kind of light stabilizer, which can absorb the ultraviolet part of sunlight and fluorescent light source without changing itself.

Uv absorbers are the most widely used light stabilizers, which can be divided into salicylate, benzophenone, benzotriazole, substituted acrylonitrile and triazines according to their structure. The most widely used light stabilizers are benzophenone and benzotriazole in industry. Quench agent is mainly metal complex, such as divalent nickel complex, and often used with ultraviolet absorber, play a synergistic effect

Because the sun's light contains a large amount of ultraviolet light which is harmful to colored objects, its wavelength is about 290-460 nm. These harmful ultraviolet light causes color molecules to break down and fade by chemical Redox reaction.

There are physical and chemical ways to prevent harmful ultraviolet light from damaging colors.

Here is a brief introduction to the chemical method, that is, the use of uv absorbers to protect the object to implement effective prevention, or weaken its damage to the color.

Uv absorbers should have the following conditions

Can strongly absorb ultraviolet rays (especially the wavelength of 290-400nm); (2) good thermal stability, even in the process will not change because of heat, heat volatility is small; (3) Good chemical stability, not adverse reaction with the material components in the product; (4) good miscibility, can be evenly dispersed in the material, not spray frost, not seepage; (5) The absorbent itself has good photochemical stability, does not decompose, does not change color; 6. Colorless, non-toxic and odorless; Immersion wash; Cheap and easy to get, 9. Insoluble or insoluble in water.

According to the chemical structure, uv absorbers can be divided into the following categories: salicylate, phenyl ketones, benzotriazole, substituted acrylonitrile, triazines and blocked amines.